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你可知我从未惧怕奔赴

#1 Created at ... [Delete] [Delete and Lock User]

L2=[s.lower() for s in L1 if isinstance(s,str)]

YCH_2018

#2 Created at ... [Delete] [Delete and Lock User]

L1 = ['Hello', 'World', 18, 'Apple', None] L2 = [s.lower() for s in L1 if isinstance(s, str)] print (L2)

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